Convection reciprocating type flat wire motor stator oil cooling structure

Abstract

The utility model discloses a convection reciprocating type flat wire motor stator oil cooling structure which comprises a stator iron core, a stator groove is arranged on the inner side of the stator iron core, copper wires are fully inserted in the stator groove, oil through holes are arranged at the bottom of the stator groove, oil through holes are arranged on the stator iron core close to the outer circle side, and the oil through holes are arranged in multiple groups. The oil through holes are alternately arranged in the transverse direction and the longitudinal direction, every two adjacent transverse oil through holes and longitudinal oil through holes form a group, insulating end rings are installed on the two sides of the stator iron core, each group of oil through holes in the outer circle side of the stator iron core and the corresponding oil through holes in the bottoms of the stator grooves are communicated and sealed to form a closed ring, and the insulating end rings on the same side form a sealed closed ring every other group of oil through holes. According to the utility model, the double-layer oil through holes are arranged on the stator iron core close to the outer circle and the bottom of the stator groove, so that the cooling area of the stator iron core is increased, oil enters the stator iron core from the left side and the right side for convective heat exchange, and the oil is sprayed on a copper wire after circulating once in the stator iron core, so that the heat dissipation efficiency is greatly improved.

Description

A stator oil-cooling structure for a convective reciprocating flat wire motor Technical Field

[0001] This utility model belongs to the field of flat wire motor technology, and specifically relates to a stator oil-cooling structure for a convection reciprocating flat wire motor. Background Technology

[0002] With the continuous development of new energy electric vehicles and the ongoing iterative innovation from water-cooled electric drive systems to oil-cooled motor systems, more and more oil-cooled motor products are being developed and applied. Currently, several different heat dissipation structures exist for oil-cooled motors on the market: some cool the copper wires at the ends; some have oil flowing through the middle of the stator's outer circumference and exiting at both ends to ultimately cool the copper wires at both ends; and others have oil flowing in from both ends of the stator's outer circumference and exiting from the other end to ultimately cool the copper wires at both ends. However, for the copper wires and iron core, which generate significant heat, there is indirect contact, and heat can only be removed through heat conduction, resulting in low heat exchange efficiency due to the long distance. This heat dissipation method has the following problems:

[0003] 1. The existing oil cooling solution improves heat dissipation efficiency by slotting the outer circle of the iron core. However, the distance between the cooling oil channel and the heating coil is relatively far, resulting in insufficient heat exchange. There is still room for improvement.

[0004] 2. Existing oil-cooling solutions have slots on the outer circumference of the iron core, which reduces the contact area between the iron core and the shell. This requires a larger interference fit to ensure torque transmission, which brings greater challenges to the weight reduction design of the shell.

[0005] 3. Existing oil cooling solutions require multiple rotations of the iron core laminations to form complex oil circuits, which brings greater difficulties to manufacturing and product costs, and is not conducive to mass production;

[0006] 4. Existing oil-cooling solutions use two or more laminations to form the stator core, resulting in relatively high mold costs.

[0007] Chinese Invention Patent: An oil-cooled motor with an outer diameter oil passage (Patent Publication No.: CN222072848U). The oil-cooled motor is composed of two types of laminations stacked together to form a stator core. The two types of laminations are stacked and rotated alternately to form a relatively complex oil circuit. Finally, cooling oil is sprayed out from the oil holes at both ends to cool the copper wires at both ends.

[0008] This invention patent achieves a larger oil passage contact area by opening holes in the stator's outer diameter, allowing the cooling oil to adequately cool the stator. However, it also has some drawbacks:

[0009] 1. Grooving the outer circle of the stator away from the coil where the most heat is generated reduces the heat exchange efficiency. Compared with the design that is close to the copper wire in the groove, the heat exchange capacity is insufficient.

[0010] 2. The slots on the outer circle of the stator reduce the contact area between the core and the shell. Under high torque conditions, a larger interference fit is required to compensate for the insufficient contact area, which will increase the stress on the shell. Therefore, the shell thickness needs to be increased to avoid the strength problems caused by the increased interference force.

[0011] 3. This stator design requires multiple rotations of the iron core laminations to form the oil passage. At the same time, two layers of baffles are needed in the middle and at both ends to restrict the flow of oil. This increases the manufacturing difficulty of the iron core, increases the mold cost, and the iron core welding process is also relatively complex.

[0012] 4. In this stator design, the oil enters the central oil circuit of the stator from the upper middle part, then flows into both ends of the stator from the lower side, and then flows out from the end plates on both sides to cool the copper wires at the ends. This large loop cooling method greatly increases the flow resistance of the oil circuit, which requires a larger oil pump to match. Otherwise, it will cause poor oil circulation and reduce the cooling effect, which also leads to an increase in the overall cost of the solution. Summary of the Invention

[0013] The main objective of this invention is to provide a convective reciprocating flat wire motor stator oil cooling structure, which solves the problems of low heat exchange efficiency caused by the oil circuit of the stator core being far from the copper wire in the stator slot, and insufficient torque transmission capacity caused by insufficient contact area between the stator outer circle slot and the housing due to the slotting.

[0014] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a stator oil-cooling structure for a convection reciprocating flat wire motor, comprising a stator core, a stator slot provided on the inner side of the stator core, the stator slot being filled with copper wire, an oil passage hole provided near the bottom of the stator slot, and an oil passage hole also provided near the outer circumference of the stator core, the oil passage holes being arranged in multiple groups, the oil passage holes being arranged alternately in the horizontal and vertical directions, each adjacent horizontal and vertical oil passage hole forming a group, insulating end rings being installed on both sides of the stator core, the insulating end rings being tightly attached to the ends of the stator core, and connecting and sealing each group of oil passage holes on the outer circumference of the stator core with the corresponding oil passage hole at the bottom of the stator slot to form a closed loop, the insulating end rings on the same side forming a sealed closed loop every other group of oil passage holes, and the insulating end rings on both sides being staggered by one group of oil passage hole angles.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In this utility model, the cooling oil paths on the left and right sides are staggered by a set of oil passages, which forms convective heat transfer and increases heat transfer efficiency. At the same time, the cooling oil on each oil path flows from the oil passage on the outer circle of one side to the other side, and then flows back from the oil passage on the stator slot side of the other side to spray onto the copper wire, which increases the contact area between the cooling oil and the stator core. In addition, the cooling oil path is close to the copper wire with high heat generation, and the distance between the cooling oil path and the heating coil is close, which improves the heat dissipation capacity.

[0017] 2. The outer circle of the stator core is a complete circle without oil passages, which ensures the contact area between the stator core and the housing, eliminating the need for additional interference fit;

[0018] 3. This invention increases the cooling area of ​​the stator core by providing double-layered oil passages near the outer circumference and near the bottom of the stator slots. This allows oil to enter the stator core from both sides for convective heat transfer, and the oil is sprayed onto the copper wires after circulating once within the stator core, significantly improving heat dissipation efficiency. Furthermore, the stator core does not require rotating laminations to form oil channels, reducing manufacturing difficulty and cost. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the stator oil cooling structure of a convection reciprocating flat wire motor according to the present invention.

[0020] Figure 2 is an exploded structural diagram of the stator oil-cooling structure of a convection reciprocating flat wire motor according to the present invention.

[0021] Figure 3 is a cross-sectional flow diagram of the stator oil passage of a convective reciprocating flat wire motor stator oil cooling structure according to this utility model.

[0022] In the diagram: 1. Insulating end ring; 2. Stator core; 3. Heating coil. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Referring to Figures 1, 2, and 3, this utility model discloses a stator oil-cooling structure for a convective reciprocating flat wire motor, including a stator core 2. A stator slot is provided on the inner side of the stator core 2, and the stator slot is filled with copper wire. Further, an oil passage hole is provided near the bottom of the stator slot, and an oil passage hole is also provided near the outer circle side of the stator core 2. The oil passage holes are arranged in multiple groups, and the oil passage holes are arranged alternately in the horizontal and vertical directions, with each adjacent horizontal and vertical oil passage hole forming a group.

[0025] Furthermore, insulating end rings 1 are installed on both sides of the stator core 2. The insulating end rings 1 are tightly attached to the ends of the stator core 2 and connect and seal each set of oil passage holes on the outer circle side with the corresponding oil passage holes at the bottom of the stator slot to form a closed loop. The insulating end rings 1 on the same side form a sealed closed loop every other set of oil passage holes, and the insulating end rings 1 on both sides are staggered by a set of oil passage hole angles. Cooling oil enters the insulating end rings 1 on both sides from the upper part of the left and right sides of the stator, respectively. In this way, the cooling oil entering from the left side of the stator can enter from the oil passage hole on the outer circle side of the left side, pass through the oil passage hole on the outer circle side to the right side, and then flow back to the left side from the oil passage hole near the stator slot in the closed loop on the right side. It is then sprayed onto the copper wire from the oil passage hole near the stator slot on the left side to directly cool the copper wire.

[0026] Similarly, the cooling oil entering from the right side also enters through the oil passage on the outer circle side of the right side, flows through the oil passage on the outer circle side to the left side, and then flows back to the right side through the oil passage near the stator slot in the left closed loop, and is sprayed onto the copper wire through the oil passage near the stator slot on the left side.

[0027] The cooling oil paths on the left and right sides are staggered by a set of oil passages, which forms convective heat transfer and increases heat transfer efficiency. At the same time, the cooling oil on each oil path flows from the oil passage on the outer circle of one side to the other side, and then flows back from the oil passage on the stator slot side of the other side to spray onto the copper wire, which increases the contact area between the cooling oil and the stator core 2. Meanwhile, the cooling oil path is close to the copper wire with high heat generation, and the cooling oil path is close to the heating coil 3, which improves the heat dissipation capacity.

[0028] It should be noted that the outer circle of the stator core 2 is a complete circle without oil passages, which ensures the contact area between the stator core 2 and the housing, eliminating the need for additional interference fit.

[0029] This invention increases the cooling area of ​​the stator core 2 by providing double-layered oil passages near the outer circumference and near the bottom of the stator slots. This allows oil to enter the stator core 2 from both sides for convective heat transfer, and the oil is sprayed onto the copper wire after circulating once within the stator core 2, greatly improving heat dissipation efficiency. Furthermore, the stator core 2 does not require rotating laminations to form oil channels, reducing manufacturing difficulty and cost.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stator oil-cooling structure for a convective reciprocating flat wire motor, characterized in that: The stator core (2) includes a stator slot on its inner side, which is filled with copper wire. An oil passage hole is provided near the bottom of the stator slot. An oil passage hole is also provided near the outer circle of the stator core (2). The oil passage holes are arranged in multiple groups, and are arranged alternately in the horizontal and vertical directions. Each adjacent horizontal and vertical oil passage hole is a group. Insulating end rings (1) are installed on both sides of the stator core (2). The insulating end rings (1) are tightly attached to the end of the stator core (2) and connect each group of oil passage holes on the outer circle of the stator core (2) with the corresponding oil passage hole at the bottom of the stator slot to form a closed loop. The insulating end rings (1) on the same side form a closed loop every other group of oil passage holes. The insulating end rings (1) on both sides are staggered by one group of oil passage hole angles.

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